Composite articles made by process for joining brass part and silicon carbide ceramic part

Abstract

A process for joining a brass part and a silicon carbide ceramic part comprising: providing a brass part, a SiC ceramic part, a Ti foil and a Ni foil; placing the SiC ceramic part, the Ti foil, the Ni foil, and the brass part into a mold, the Ti foil and the Ni foil located between the SiC ceramic part and the brass part, the Ti foil abutting against the SiC ceramic part, the Ni foil abutting against the brass part and the Ti foil; placing the mold into a chamber of an hot press sintering device, heating the chamber and pressing the brass part, the SiC ceramic part, the Ti foil, and the Ni foil at least until the brass part, the SiC ceramic part, the Ti foil and the Ni foil form a integral composite article.

1. A composite article, comprising:
 a SiC ceramic part, 
 a brass part, and 
 a connecting layer that connects the SiC ceramic part to the brass part, wherein the connecting layer is formed by placing a Ti foil and a Ni foil between the SiC ceramic part and the brass part with the Ti foil abutting the SiC ceramic part and the Ni foil abutting the brass part, then heating and pressing the SiC ceramic part, the brass part, the Ti foil and the Ni foil; 
 wherein the connecting layer includes a first transition layer adjacent to the SiC part, a Ti layer, a second transition layer, a Ni layer, and a third transition layer adjacent to the brass part, and in that order; the third transition layer located between the Ni layer and the brass part mainly includes Ni—Cu solid solutions; and the thermal expansion rate of the connecting layer gradually changes from that of the first transition layer to that of the third transition layer. 
 
     
     
       2. The composite article as claimed in  claim 1 , wherein the first transition layer located between the SiC ceramic part and the Ti layer mainly includes compounds comprising Ti element and C element. 
     
     
       3. The composite article as claimed in  claim 2 , wherein the compounds include SiC and Ti 2 C. 
     
     
       4. The composite article as claimed in  claim 1 , wherein the second transition layer located between the Ti layer and the Ni layer mainly includes compounds comprised of Ti element and Ni element, and Ni-Ti alloy solid solutions. 
     
     
       5. A composite article, comprising:
 a SiC ceramic part, a brass part, and 
 a multi-layered connecting layer that connects the SiC ceramic part to the brass part, wherein the connecting layer comprises: 
 a first layer adjacent to the SiC part, the first layer having a thermal expansion rate close to that of the SiC part and comprising results of chemical reactions between SiC and Ti; 
 a second laver, adjacent to the first layer and comprising Ti; 
 a third layer, adjacent to the second layer and comprising results of chemical reactions between Ti and Ni; 
 a fourth layer, adjacent to the third layer and comprising Ni; and 
 a last layer adjacent to the brass part and the brass part, the last layer having a thermal expansion rate close to that of the brass part and comprising results of chemical reactions between Ni and brass; and 
 the thermal expansion rate of the connecting layer gradually changes from that of the first layer to that of the last layer.